Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 91FC1C61DA4 for ; Mon, 6 Mar 2023 18:06:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231208AbjCFSG5 (ORCPT ); Mon, 6 Mar 2023 13:06:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229967AbjCFSGm (ORCPT ); Mon, 6 Mar 2023 13:06:42 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D5266E696 for ; Mon, 6 Mar 2023 10:05:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1678125908; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=bX9ZOH2qME/Vd0SYTRbzqrUXGxOcqFnRgnJD+kBL/DY=; b=OEB9qDfGb3mU1vwd5+mJrfcKY8tgqI/krJG2JHUtjg+2Mf9h0/nNwTKMx+oUGbVmQVAW7r rn13OqS2IaSrGEimIRF0Bg6Hn/zLSIrswMJMuS7KsAvmah37iluB4Clu8edKtEBAQSmicb GNmXlFWqb2TIHnbeVMscUnU7yBBxp94= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-130-X0o_EJQYNrCgE2PjHPyyIw-1; Mon, 06 Mar 2023 13:05:02 -0500 X-MC-Unique: X0o_EJQYNrCgE2PjHPyyIw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 83B0818E0925; Mon, 6 Mar 2023 18:05:01 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.45.224.76]) by smtp.corp.redhat.com (Postfix) with SMTP id 10B19C16029; Mon, 6 Mar 2023 18:04:58 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Mon, 6 Mar 2023 19:04:55 +0100 (CET) Date: Mon, 6 Mar 2023 19:04:52 +0100 From: Oleg Nesterov To: Gregory Price Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, avagin@gmail.com, peterz@infradead.org, luto@kernel.org, krisman@collabora.com, tglx@linutronix.de, corbet@lwn.net, shuah@kernel.org, Gregory Price Subject: Re: [PATCH v13 2/3] ptrace,syscall_user_dispatch: checkpoint/restore support for SUD Message-ID: <20230306180451.GB13201@redhat.com> References: <20230301205843.2164-1-gregory.price@memverge.com> <20230301205843.2164-3-gregory.price@memverge.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230301205843.2164-3-gregory.price@memverge.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/01, Gregory Price wrote: > > Implement ptrace getter/setter interface for syscall user dispatch. > > These prctl settings are presently write-only, making it impossible to > implement transparent checkpoint/restore via software like CRIU. > > 'on_dispatch' field is not exposed because it is a kernel-internal > only field that cannot be 'true' when returning to userland. > > Signed-off-by: Gregory Price Reviewed-by: Oleg Nesterov